Depreciation for Partial Periods Norman Delivery Company purchased a new delivery truck for $51,000 on April 1, 2019. The truck is expected to have a service life of 10 years or 120,000 miles and a residual value of $3,000. The truck was driven 8,000 miles in 2019 and 18,000 miles in 2020. Norman computes depreciation expense to the nearest whole month. Required: 1. Compute depreciation expense for 2019 and 2020 using the following methods: (Round your answers to the nearest dollar.) a. Straight-line method 2019 2020 b. Sum-of-the-years'-digits method 2019 2020 c. Double-declining-balance method 2019 2020 d. Activity method 2019 2020 2. For each method, what is the book value of the machine at the end of 2019? At the end of 2020? (Round your answers to the nearest dollar.) a. Straight-line method 2019 2020 b. Sum-of-the-years'-digits method 2019 2020 c. Double-declining-balance method 2019 2020 d. Activity method 2019 2020